On the basis of characteristics of Social Networking Services (SNS), this paper modifies the traditional SEIR model by analyzing the influence of the information value and user behavior on information dissemination, and then the S‐SEIR model on SNS is proposed. In S‐SEIR model, the relevance of the information value and the rate of information audit are considered, and the influence of user behavior on he users number of each state also is researched. Simulation results show that: S‐SEIR model can well simulate information dissemination process on social network.